I have hooked up my Monitor to the VGA Port and my LCD TV through the HDMI Port.
Now before i got the Sapphire HD7850 1GB I have used a Gigabyte HD6850OC 1GB which was perfect with playing audio, but the Sapphire just won't let me hear a thing unless I restart my PC when the option on windows is set to Extend Monitors, once i return to one screen mode and get the split screen back on the audio is missing again.
I have fresh installed a Windows 8 64bit, but the problem existed on Windows 7 as well.

P.S When im going to Sound->Playback options i see 1-6 Digital Display Audio(Not Plugged In).

The card has 2DVI's, 1HDMI and One DP port.

Thanks in advance,

Alex.

Try this:

http://forums.amd.com/game/messageview.cfm?catid=454&threadid=161212&highlight_key=y